. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 112 PESTS OF GABDEX AXD FIELD CROPS two fifths of an inch long, slender, whitish or yellowish, and has a black or brown head. The adult is a small beetle, greenish in color, one fourth of an inch in length. It is. Fig. 7-t. —The Western Corn Root- worm. Adult. Enlarged and natu- ral size. Orieinal. found occasion- ally on melons orsquashes. along with its relative, the striped cu- cumber beetle, but is more apt to be seen on sun- flowers, golden rod, or thistle blossoms. There is one generation each year. The
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 112 PESTS OF GABDEX AXD FIELD CROPS two fifths of an inch long, slender, whitish or yellowish, and has a black or brown head. The adult is a small beetle, greenish in color, one fourth of an inch in length. It is. Fig. 7-t. —The Western Corn Root- worm. Adult. Enlarged and natu- ral size. Orieinal. found occasion- ally on melons orsquashes. along with its relative, the striped cu- cumber beetle, but is more apt to be seen on sun- flowers, golden rod, or thistle blossoms. There is one generation each year. The winter is passed as eggs beneath the surface of the ground. The simplest means of control is crop rotation. The eggs are laid only in cornfields in late summer, and the htivs are injurious only to com. If com is planted in fields that have been in other crops, it will not be injured. In practice it is usually safe to run com two years in succession, changing to another crop the third year. Corn-root Webworms {Cramhu-i spp.) Young com plants are seriously injured or killed by several species of webworms feeding on the roots, or on the stalk close to the surface of the ground. The outward evidence of attack is the stunted growth of the com or the death of young plants. Injury is always worse in ground just broken up from sod. The same insects attack in similar fashion young tobacco plants in certain eastern sections. Several species are recorded. aU in the genus Crambus. and including C. rulrirageUu-i Clem., C. lukoknus Clem., C. triuctus Walk., and C. Clem. Fig. 75. — Work of the West- ern Com Root- worm. Origi- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
